Small, giggable closed-back combo

[coyote-1]

A little bass combo can sound good if you want a very clean sound.

this is a great option for high headroom, flat frequency response, especially if it has a graphic EQ

The Crate BX-100 is not little, but fits this bill perfectly. It even has a 15” speaker, like the old Polytones.
I use one. Its only issue is weight. Up until just a couple years ago this was a non-issue. But age does take a toll lol

The amp had a successor, the BFX100. Same amp, but with built-in effects. Most of which are lame, but the reverb’s not bad. I’m considering finding one of these, and building a lightweight cabinet for it.

[Lionelsax]

The Crate BX-100 is not little, but fits this bill perfectly. It even has a 15” speaker, like the old Polytones.
I use one. Its only issue is weight. Up until just a couple years ago this was a non-issue. But age does take a toll lol

The amp had a successor, the BFX100. Same amp, but with built-in effects. Most of which are lame, but the reverb’s not bad. I’m considering finding one of these, and building a lightweight cabinet for it.

I rehearsal on a Laney LX15B, I even played a gig with.
For the guitar it's really powerful and warm, for the bass ironically it doesn't work very well (a very harsh sound).

[coyote-1]

If the OP could swing an amp slightly wider (16.5”) but still lightweight, the Fender Rumble 40 is a great gigging option as a jazz guitar amp. It’s clear, well balanced, and has enough headroom to support guitar for a large group (6-7 players).